1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * video.c - ACPI Video Driver |
4 | * |
5 | * Copyright (C) 2004 Luming Yu <luming.yu@intel.com> |
6 | * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org> |
7 | * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net> |
8 | */ |
9 | |
10 | #define pr_fmt(fmt) "ACPI: video: " fmt |
11 | |
12 | #include <linux/kernel.h> |
13 | #include <linux/module.h> |
14 | #include <linux/init.h> |
15 | #include <linux/types.h> |
16 | #include <linux/list.h> |
17 | #include <linux/mutex.h> |
18 | #include <linux/input.h> |
19 | #include <linux/backlight.h> |
20 | #include <linux/thermal.h> |
21 | #include <linux/sort.h> |
22 | #include <linux/pci.h> |
23 | #include <linux/pci_ids.h> |
24 | #include <linux/slab.h> |
25 | #include <linux/dmi.h> |
26 | #include <linux/suspend.h> |
27 | #include <linux/acpi.h> |
28 | #include <acpi/video.h> |
29 | #include <linux/uaccess.h> |
30 | |
31 | #define ACPI_VIDEO_BUS_NAME "Video Bus" |
32 | #define ACPI_VIDEO_DEVICE_NAME "Video Device" |
33 | |
34 | #define MAX_NAME_LEN 20 |
35 | |
36 | MODULE_AUTHOR("Bruno Ducrot" ); |
37 | MODULE_DESCRIPTION("ACPI Video Driver" ); |
38 | MODULE_LICENSE("GPL" ); |
39 | |
40 | static bool brightness_switch_enabled = true; |
41 | module_param(brightness_switch_enabled, bool, 0644); |
42 | |
43 | /* |
44 | * By default, we don't allow duplicate ACPI video bus devices |
45 | * under the same VGA controller |
46 | */ |
47 | static bool allow_duplicates; |
48 | module_param(allow_duplicates, bool, 0644); |
49 | |
50 | #define REPORT_OUTPUT_KEY_EVENTS 0x01 |
51 | #define REPORT_BRIGHTNESS_KEY_EVENTS 0x02 |
52 | static int report_key_events = -1; |
53 | module_param(report_key_events, int, 0644); |
54 | MODULE_PARM_DESC(report_key_events, |
55 | "0: none, 1: output changes, 2: brightness changes, 3: all" ); |
56 | |
57 | static int hw_changes_brightness = -1; |
58 | module_param(hw_changes_brightness, int, 0644); |
59 | MODULE_PARM_DESC(hw_changes_brightness, |
60 | "Set this to 1 on buggy hw which changes the brightness itself when " |
61 | "a hotkey is pressed: -1: auto, 0: normal 1: hw-changes-brightness" ); |
62 | |
63 | /* |
64 | * Whether the struct acpi_video_device_attrib::device_id_scheme bit should be |
65 | * assumed even if not actually set. |
66 | */ |
67 | static bool device_id_scheme = false; |
68 | module_param(device_id_scheme, bool, 0444); |
69 | |
70 | static int only_lcd = -1; |
71 | module_param(only_lcd, int, 0444); |
72 | |
73 | static bool may_report_brightness_keys; |
74 | static int register_count; |
75 | static DEFINE_MUTEX(register_count_mutex); |
76 | static DEFINE_MUTEX(video_list_lock); |
77 | static LIST_HEAD(video_bus_head); |
78 | static int acpi_video_bus_add(struct acpi_device *device); |
79 | static void acpi_video_bus_remove(struct acpi_device *device); |
80 | static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data); |
81 | |
82 | /* |
83 | * Indices in the _BCL method response: the first two items are special, |
84 | * the rest are all supported levels. |
85 | * |
86 | * See page 575 of the ACPI spec 3.0 |
87 | */ |
88 | enum acpi_video_level_idx { |
89 | ACPI_VIDEO_AC_LEVEL, /* level when machine has full power */ |
90 | ACPI_VIDEO_BATTERY_LEVEL, /* level when machine is on batteries */ |
91 | ACPI_VIDEO_FIRST_LEVEL, /* actual supported levels begin here */ |
92 | }; |
93 | |
94 | static const struct acpi_device_id video_device_ids[] = { |
95 | {ACPI_VIDEO_HID, 0}, |
96 | {"" , 0}, |
97 | }; |
98 | MODULE_DEVICE_TABLE(acpi, video_device_ids); |
99 | |
100 | static struct acpi_driver acpi_video_bus = { |
101 | .name = "video" , |
102 | .class = ACPI_VIDEO_CLASS, |
103 | .ids = video_device_ids, |
104 | .ops = { |
105 | .add = acpi_video_bus_add, |
106 | .remove = acpi_video_bus_remove, |
107 | }, |
108 | }; |
109 | |
110 | struct acpi_video_bus_flags { |
111 | u8 multihead:1; /* can switch video heads */ |
112 | u8 rom:1; /* can retrieve a video rom */ |
113 | u8 post:1; /* can configure the head to */ |
114 | u8 reserved:5; |
115 | }; |
116 | |
117 | struct acpi_video_bus_cap { |
118 | u8 _DOS:1; /* Enable/Disable output switching */ |
119 | u8 _DOD:1; /* Enumerate all devices attached to display adapter */ |
120 | u8 _ROM:1; /* Get ROM Data */ |
121 | u8 _GPD:1; /* Get POST Device */ |
122 | u8 _SPD:1; /* Set POST Device */ |
123 | u8 _VPO:1; /* Video POST Options */ |
124 | u8 reserved:2; |
125 | }; |
126 | |
127 | struct acpi_video_device_attrib { |
128 | u32 display_index:4; /* A zero-based instance of the Display */ |
129 | u32 display_port_attachment:4; /* This field differentiates the display type */ |
130 | u32 display_type:4; /* Describe the specific type in use */ |
131 | u32 vendor_specific:4; /* Chipset Vendor Specific */ |
132 | u32 bios_can_detect:1; /* BIOS can detect the device */ |
133 | u32 depend_on_vga:1; /* Non-VGA output device whose power is related to |
134 | the VGA device. */ |
135 | u32 pipe_id:3; /* For VGA multiple-head devices. */ |
136 | u32 reserved:10; /* Must be 0 */ |
137 | |
138 | /* |
139 | * The device ID might not actually follow the scheme described by this |
140 | * struct acpi_video_device_attrib. If it does, then this bit |
141 | * device_id_scheme is set; otherwise, other fields should be ignored. |
142 | * |
143 | * (but also see the global flag device_id_scheme) |
144 | */ |
145 | u32 device_id_scheme:1; |
146 | }; |
147 | |
148 | struct acpi_video_enumerated_device { |
149 | union { |
150 | u32 int_val; |
151 | struct acpi_video_device_attrib attrib; |
152 | } value; |
153 | struct acpi_video_device *bind_info; |
154 | }; |
155 | |
156 | struct acpi_video_bus { |
157 | struct acpi_device *device; |
158 | bool backlight_registered; |
159 | u8 dos_setting; |
160 | struct acpi_video_enumerated_device *attached_array; |
161 | u8 attached_count; |
162 | u8 child_count; |
163 | struct acpi_video_bus_cap cap; |
164 | struct acpi_video_bus_flags flags; |
165 | struct list_head video_device_list; |
166 | struct mutex device_list_lock; /* protects video_device_list */ |
167 | struct list_head entry; |
168 | struct input_dev *input; |
169 | char phys[32]; /* for input device */ |
170 | struct notifier_block pm_nb; |
171 | }; |
172 | |
173 | struct acpi_video_device_flags { |
174 | u8 crt:1; |
175 | u8 lcd:1; |
176 | u8 tvout:1; |
177 | u8 dvi:1; |
178 | u8 bios:1; |
179 | u8 unknown:1; |
180 | u8 notify:1; |
181 | u8 reserved:1; |
182 | }; |
183 | |
184 | struct acpi_video_device_cap { |
185 | u8 _ADR:1; /* Return the unique ID */ |
186 | u8 _BCL:1; /* Query list of brightness control levels supported */ |
187 | u8 _BCM:1; /* Set the brightness level */ |
188 | u8 _BQC:1; /* Get current brightness level */ |
189 | u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */ |
190 | u8 _DDC:1; /* Return the EDID for this device */ |
191 | }; |
192 | |
193 | struct acpi_video_device { |
194 | unsigned long device_id; |
195 | struct acpi_video_device_flags flags; |
196 | struct acpi_video_device_cap cap; |
197 | struct list_head entry; |
198 | struct delayed_work switch_brightness_work; |
199 | int switch_brightness_event; |
200 | struct acpi_video_bus *video; |
201 | struct acpi_device *dev; |
202 | struct acpi_video_device_brightness *brightness; |
203 | struct backlight_device *backlight; |
204 | struct thermal_cooling_device *cooling_dev; |
205 | }; |
206 | |
207 | static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data); |
208 | static void acpi_video_device_rebind(struct acpi_video_bus *video); |
209 | static void acpi_video_device_bind(struct acpi_video_bus *video, |
210 | struct acpi_video_device *device); |
211 | static int acpi_video_device_enumerate(struct acpi_video_bus *video); |
212 | static int acpi_video_device_lcd_set_level(struct acpi_video_device *device, |
213 | int level); |
214 | static int acpi_video_device_lcd_get_level_current( |
215 | struct acpi_video_device *device, |
216 | unsigned long long *level, bool raw); |
217 | static int acpi_video_get_next_level(struct acpi_video_device *device, |
218 | u32 level_current, u32 event); |
219 | static void acpi_video_switch_brightness(struct work_struct *work); |
220 | |
221 | /* backlight device sysfs support */ |
222 | static int acpi_video_get_brightness(struct backlight_device *bd) |
223 | { |
224 | unsigned long long cur_level; |
225 | int i; |
226 | struct acpi_video_device *vd = bl_get_data(bl_dev: bd); |
227 | |
228 | if (acpi_video_device_lcd_get_level_current(device: vd, level: &cur_level, raw: false)) |
229 | return -EINVAL; |
230 | for (i = ACPI_VIDEO_FIRST_LEVEL; i < vd->brightness->count; i++) { |
231 | if (vd->brightness->levels[i] == cur_level) |
232 | return i - ACPI_VIDEO_FIRST_LEVEL; |
233 | } |
234 | return 0; |
235 | } |
236 | |
237 | static int acpi_video_set_brightness(struct backlight_device *bd) |
238 | { |
239 | int request_level = bd->props.brightness + ACPI_VIDEO_FIRST_LEVEL; |
240 | struct acpi_video_device *vd = bl_get_data(bl_dev: bd); |
241 | |
242 | cancel_delayed_work(dwork: &vd->switch_brightness_work); |
243 | return acpi_video_device_lcd_set_level(device: vd, |
244 | level: vd->brightness->levels[request_level]); |
245 | } |
246 | |
247 | static const struct backlight_ops acpi_backlight_ops = { |
248 | .get_brightness = acpi_video_get_brightness, |
249 | .update_status = acpi_video_set_brightness, |
250 | }; |
251 | |
252 | /* thermal cooling device callbacks */ |
253 | static int video_get_max_state(struct thermal_cooling_device *cooling_dev, |
254 | unsigned long *state) |
255 | { |
256 | struct acpi_device *device = cooling_dev->devdata; |
257 | struct acpi_video_device *video = acpi_driver_data(d: device); |
258 | |
259 | *state = video->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1; |
260 | return 0; |
261 | } |
262 | |
263 | static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, |
264 | unsigned long *state) |
265 | { |
266 | struct acpi_device *device = cooling_dev->devdata; |
267 | struct acpi_video_device *video = acpi_driver_data(d: device); |
268 | unsigned long long level; |
269 | int offset; |
270 | |
271 | if (acpi_video_device_lcd_get_level_current(device: video, level: &level, raw: false)) |
272 | return -EINVAL; |
273 | for (offset = ACPI_VIDEO_FIRST_LEVEL; offset < video->brightness->count; |
274 | offset++) |
275 | if (level == video->brightness->levels[offset]) { |
276 | *state = video->brightness->count - offset - 1; |
277 | return 0; |
278 | } |
279 | |
280 | return -EINVAL; |
281 | } |
282 | |
283 | static int |
284 | video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state) |
285 | { |
286 | struct acpi_device *device = cooling_dev->devdata; |
287 | struct acpi_video_device *video = acpi_driver_data(d: device); |
288 | int level; |
289 | |
290 | if (state >= video->brightness->count - ACPI_VIDEO_FIRST_LEVEL) |
291 | return -EINVAL; |
292 | |
293 | state = video->brightness->count - state; |
294 | level = video->brightness->levels[state - 1]; |
295 | return acpi_video_device_lcd_set_level(device: video, level); |
296 | } |
297 | |
298 | static const struct thermal_cooling_device_ops video_cooling_ops = { |
299 | .get_max_state = video_get_max_state, |
300 | .get_cur_state = video_get_cur_state, |
301 | .set_cur_state = video_set_cur_state, |
302 | }; |
303 | |
304 | /* |
305 | * -------------------------------------------------------------------------- |
306 | * Video Management |
307 | * -------------------------------------------------------------------------- |
308 | */ |
309 | |
310 | static int |
311 | acpi_video_device_lcd_query_levels(acpi_handle handle, |
312 | union acpi_object **levels) |
313 | { |
314 | int status; |
315 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
316 | union acpi_object *obj; |
317 | |
318 | |
319 | *levels = NULL; |
320 | |
321 | status = acpi_evaluate_object(object: handle, pathname: "_BCL" , NULL, return_object_buffer: &buffer); |
322 | if (ACPI_FAILURE(status)) |
323 | return status; |
324 | obj = (union acpi_object *)buffer.pointer; |
325 | if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) { |
326 | acpi_handle_info(handle, "Invalid _BCL data\n" ); |
327 | status = -EFAULT; |
328 | goto err; |
329 | } |
330 | |
331 | *levels = obj; |
332 | |
333 | return 0; |
334 | |
335 | err: |
336 | kfree(objp: buffer.pointer); |
337 | |
338 | return status; |
339 | } |
340 | |
341 | static int |
342 | acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level) |
343 | { |
344 | int status; |
345 | int state; |
346 | |
347 | status = acpi_execute_simple_method(handle: device->dev->handle, |
348 | method: "_BCM" , arg: level); |
349 | if (ACPI_FAILURE(status)) { |
350 | acpi_handle_info(device->dev->handle, "_BCM evaluation failed\n" ); |
351 | return -EIO; |
352 | } |
353 | |
354 | device->brightness->curr = level; |
355 | for (state = ACPI_VIDEO_FIRST_LEVEL; state < device->brightness->count; |
356 | state++) |
357 | if (level == device->brightness->levels[state]) { |
358 | if (device->backlight) |
359 | device->backlight->props.brightness = |
360 | state - ACPI_VIDEO_FIRST_LEVEL; |
361 | return 0; |
362 | } |
363 | |
364 | acpi_handle_info(device->dev->handle, "Current brightness invalid\n" ); |
365 | return -EINVAL; |
366 | } |
367 | |
368 | /* |
369 | * For some buggy _BQC methods, we need to add a constant value to |
370 | * the _BQC return value to get the actual current brightness level |
371 | */ |
372 | |
373 | static int bqc_offset_aml_bug_workaround; |
374 | static int video_set_bqc_offset(const struct dmi_system_id *d) |
375 | { |
376 | bqc_offset_aml_bug_workaround = 9; |
377 | return 0; |
378 | } |
379 | |
380 | static int video_set_device_id_scheme(const struct dmi_system_id *d) |
381 | { |
382 | device_id_scheme = true; |
383 | return 0; |
384 | } |
385 | |
386 | static int video_enable_only_lcd(const struct dmi_system_id *d) |
387 | { |
388 | only_lcd = true; |
389 | return 0; |
390 | } |
391 | |
392 | static int video_set_report_key_events(const struct dmi_system_id *id) |
393 | { |
394 | if (report_key_events == -1) |
395 | report_key_events = (uintptr_t)id->driver_data; |
396 | return 0; |
397 | } |
398 | |
399 | static int video_hw_changes_brightness( |
400 | const struct dmi_system_id *d) |
401 | { |
402 | if (hw_changes_brightness == -1) |
403 | hw_changes_brightness = 1; |
404 | return 0; |
405 | } |
406 | |
407 | static const struct dmi_system_id video_dmi_table[] = { |
408 | /* |
409 | * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121 |
410 | */ |
411 | { |
412 | .callback = video_set_bqc_offset, |
413 | .ident = "Acer Aspire 5720" , |
414 | .matches = { |
415 | DMI_MATCH(DMI_BOARD_VENDOR, "Acer" ), |
416 | DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720" ), |
417 | }, |
418 | }, |
419 | { |
420 | .callback = video_set_bqc_offset, |
421 | .ident = "Acer Aspire 5710Z" , |
422 | .matches = { |
423 | DMI_MATCH(DMI_BOARD_VENDOR, "Acer" ), |
424 | DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z" ), |
425 | }, |
426 | }, |
427 | { |
428 | .callback = video_set_bqc_offset, |
429 | .ident = "eMachines E510" , |
430 | .matches = { |
431 | DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES" ), |
432 | DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510" ), |
433 | }, |
434 | }, |
435 | { |
436 | .callback = video_set_bqc_offset, |
437 | .ident = "Acer Aspire 5315" , |
438 | .matches = { |
439 | DMI_MATCH(DMI_BOARD_VENDOR, "Acer" ), |
440 | DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315" ), |
441 | }, |
442 | }, |
443 | { |
444 | .callback = video_set_bqc_offset, |
445 | .ident = "Acer Aspire 7720" , |
446 | .matches = { |
447 | DMI_MATCH(DMI_BOARD_VENDOR, "Acer" ), |
448 | DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720" ), |
449 | }, |
450 | }, |
451 | |
452 | /* |
453 | * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set |
454 | * but the IDs actually follow the Device ID Scheme. |
455 | */ |
456 | { |
457 | /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ |
458 | .callback = video_set_device_id_scheme, |
459 | .ident = "ESPRIMO Mobile M9410" , |
460 | .matches = { |
461 | DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS" ), |
462 | DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410" ), |
463 | }, |
464 | }, |
465 | /* |
466 | * Some machines have multiple video output devices, but only the one |
467 | * that is the type of LCD can do the backlight control so we should not |
468 | * register backlight interface for other video output devices. |
469 | */ |
470 | { |
471 | /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ |
472 | .callback = video_enable_only_lcd, |
473 | .ident = "ESPRIMO Mobile M9410" , |
474 | .matches = { |
475 | DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS" ), |
476 | DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410" ), |
477 | }, |
478 | }, |
479 | /* |
480 | * Some machines report wrong key events on the acpi-bus, suppress |
481 | * key event reporting on these. Note this is only intended to work |
482 | * around events which are plain wrong. In some cases we get double |
483 | * events, in this case acpi-video is considered the canonical source |
484 | * and the events from the other source should be filtered. E.g. |
485 | * by calling acpi_video_handles_brightness_key_presses() from the |
486 | * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb |
487 | */ |
488 | { |
489 | .callback = video_set_report_key_events, |
490 | .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS), |
491 | .ident = "Dell Vostro V131" , |
492 | .matches = { |
493 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
494 | DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131" ), |
495 | }, |
496 | }, |
497 | { |
498 | .callback = video_set_report_key_events, |
499 | .driver_data = (void *)((uintptr_t)REPORT_BRIGHTNESS_KEY_EVENTS), |
500 | .ident = "Dell Vostro 3350" , |
501 | .matches = { |
502 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc." ), |
503 | DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350" ), |
504 | }, |
505 | }, |
506 | /* |
507 | * Some machines change the brightness themselves when a brightness |
508 | * hotkey gets pressed, despite us telling them not to. In this case |
509 | * acpi_video_device_notify() should only call backlight_force_update( |
510 | * BACKLIGHT_UPDATE_HOTKEY) and not do anything else. |
511 | */ |
512 | { |
513 | /* https://bugzilla.kernel.org/show_bug.cgi?id=204077 */ |
514 | .callback = video_hw_changes_brightness, |
515 | .ident = "Packard Bell EasyNote MZ35" , |
516 | .matches = { |
517 | DMI_MATCH(DMI_SYS_VENDOR, "Packard Bell" ), |
518 | DMI_MATCH(DMI_PRODUCT_NAME, "EasyNote MZ35" ), |
519 | }, |
520 | }, |
521 | {} |
522 | }; |
523 | |
524 | static unsigned long long |
525 | acpi_video_bqc_value_to_level(struct acpi_video_device *device, |
526 | unsigned long long bqc_value) |
527 | { |
528 | unsigned long long level; |
529 | |
530 | if (device->brightness->flags._BQC_use_index) { |
531 | /* |
532 | * _BQC returns an index that doesn't account for the first 2 |
533 | * items with special meaning (see enum acpi_video_level_idx), |
534 | * so we need to compensate for that by offsetting ourselves |
535 | */ |
536 | if (device->brightness->flags._BCL_reversed) |
537 | bqc_value = device->brightness->count - |
538 | ACPI_VIDEO_FIRST_LEVEL - 1 - bqc_value; |
539 | |
540 | level = device->brightness->levels[bqc_value + |
541 | ACPI_VIDEO_FIRST_LEVEL]; |
542 | } else { |
543 | level = bqc_value; |
544 | } |
545 | |
546 | level += bqc_offset_aml_bug_workaround; |
547 | |
548 | return level; |
549 | } |
550 | |
551 | static int |
552 | acpi_video_device_lcd_get_level_current(struct acpi_video_device *device, |
553 | unsigned long long *level, bool raw) |
554 | { |
555 | acpi_status status = AE_OK; |
556 | int i; |
557 | |
558 | if (device->cap._BQC || device->cap._BCQ) { |
559 | char *buf = device->cap._BQC ? "_BQC" : "_BCQ" ; |
560 | |
561 | status = acpi_evaluate_integer(handle: device->dev->handle, pathname: buf, |
562 | NULL, data: level); |
563 | if (ACPI_SUCCESS(status)) { |
564 | if (raw) { |
565 | /* |
566 | * Caller has indicated he wants the raw |
567 | * value returned by _BQC, so don't furtherly |
568 | * mess with the value. |
569 | */ |
570 | return 0; |
571 | } |
572 | |
573 | *level = acpi_video_bqc_value_to_level(device, bqc_value: *level); |
574 | |
575 | for (i = ACPI_VIDEO_FIRST_LEVEL; |
576 | i < device->brightness->count; i++) |
577 | if (device->brightness->levels[i] == *level) { |
578 | device->brightness->curr = *level; |
579 | return 0; |
580 | } |
581 | /* |
582 | * BQC returned an invalid level. |
583 | * Stop using it. |
584 | */ |
585 | acpi_handle_info(device->dev->handle, |
586 | "%s returned an invalid level" , buf); |
587 | device->cap._BQC = device->cap._BCQ = 0; |
588 | } else { |
589 | /* |
590 | * Fixme: |
591 | * should we return an error or ignore this failure? |
592 | * dev->brightness->curr is a cached value which stores |
593 | * the correct current backlight level in most cases. |
594 | * ACPI video backlight still works w/ buggy _BQC. |
595 | * http://bugzilla.kernel.org/show_bug.cgi?id=12233 |
596 | */ |
597 | acpi_handle_info(device->dev->handle, |
598 | "%s evaluation failed" , buf); |
599 | device->cap._BQC = device->cap._BCQ = 0; |
600 | } |
601 | } |
602 | |
603 | *level = device->brightness->curr; |
604 | return 0; |
605 | } |
606 | |
607 | static int |
608 | acpi_video_device_EDID(struct acpi_video_device *device, |
609 | union acpi_object **edid, ssize_t length) |
610 | { |
611 | int status; |
612 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
613 | union acpi_object *obj; |
614 | union acpi_object arg0 = { ACPI_TYPE_INTEGER }; |
615 | struct acpi_object_list args = { 1, &arg0 }; |
616 | |
617 | |
618 | *edid = NULL; |
619 | |
620 | if (!device) |
621 | return -ENODEV; |
622 | if (length == 128) |
623 | arg0.integer.value = 1; |
624 | else if (length == 256) |
625 | arg0.integer.value = 2; |
626 | else |
627 | return -EINVAL; |
628 | |
629 | status = acpi_evaluate_object(object: device->dev->handle, pathname: "_DDC" , parameter_objects: &args, return_object_buffer: &buffer); |
630 | if (ACPI_FAILURE(status)) |
631 | return -ENODEV; |
632 | |
633 | obj = buffer.pointer; |
634 | |
635 | if (obj && obj->type == ACPI_TYPE_BUFFER) |
636 | *edid = obj; |
637 | else { |
638 | acpi_handle_info(device->dev->handle, "Invalid _DDC data\n" ); |
639 | status = -EFAULT; |
640 | kfree(objp: obj); |
641 | } |
642 | |
643 | return status; |
644 | } |
645 | |
646 | /* bus */ |
647 | |
648 | /* |
649 | * Arg: |
650 | * video : video bus device pointer |
651 | * bios_flag : |
652 | * 0. The system BIOS should NOT automatically switch(toggle) |
653 | * the active display output. |
654 | * 1. The system BIOS should automatically switch (toggle) the |
655 | * active display output. No switch event. |
656 | * 2. The _DGS value should be locked. |
657 | * 3. The system BIOS should not automatically switch (toggle) the |
658 | * active display output, but instead generate the display switch |
659 | * event notify code. |
660 | * lcd_flag : |
661 | * 0. The system BIOS should automatically control the brightness level |
662 | * of the LCD when: |
663 | * - the power changes from AC to DC (ACPI appendix B) |
664 | * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) |
665 | * 1. The system BIOS should NOT automatically control the brightness |
666 | * level of the LCD when: |
667 | * - the power changes from AC to DC (ACPI appendix B) |
668 | * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) |
669 | * Return Value: |
670 | * -EINVAL wrong arg. |
671 | */ |
672 | |
673 | static int |
674 | acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag) |
675 | { |
676 | acpi_status status; |
677 | |
678 | if (!video->cap._DOS) |
679 | return 0; |
680 | |
681 | if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) |
682 | return -EINVAL; |
683 | video->dos_setting = (lcd_flag << 2) | bios_flag; |
684 | status = acpi_execute_simple_method(handle: video->device->handle, method: "_DOS" , |
685 | arg: (lcd_flag << 2) | bios_flag); |
686 | if (ACPI_FAILURE(status)) |
687 | return -EIO; |
688 | |
689 | return 0; |
690 | } |
691 | |
692 | /* |
693 | * Simple comparison function used to sort backlight levels. |
694 | */ |
695 | |
696 | static int |
697 | acpi_video_cmp_level(const void *a, const void *b) |
698 | { |
699 | return *(int *)a - *(int *)b; |
700 | } |
701 | |
702 | /* |
703 | * Decides if _BQC/_BCQ for this system is usable |
704 | * |
705 | * We do this by changing the level first and then read out the current |
706 | * brightness level, if the value does not match, find out if it is using |
707 | * index. If not, clear the _BQC/_BCQ capability. |
708 | */ |
709 | static int acpi_video_bqc_quirk(struct acpi_video_device *device, |
710 | int max_level, int current_level) |
711 | { |
712 | struct acpi_video_device_brightness *br = device->brightness; |
713 | int result; |
714 | unsigned long long level; |
715 | int test_level; |
716 | |
717 | /* don't mess with existing known broken systems */ |
718 | if (bqc_offset_aml_bug_workaround) |
719 | return 0; |
720 | |
721 | /* |
722 | * Some systems always report current brightness level as maximum |
723 | * through _BQC, we need to test another value for them. However, |
724 | * there is a subtlety: |
725 | * |
726 | * If the _BCL package ordering is descending, the first level |
727 | * (br->levels[2]) is likely to be 0, and if the number of levels |
728 | * matches the number of steps, we might confuse a returned level to |
729 | * mean the index. |
730 | * |
731 | * For example: |
732 | * |
733 | * current_level = max_level = 100 |
734 | * test_level = 0 |
735 | * returned level = 100 |
736 | * |
737 | * In this case 100 means the level, not the index, and _BCM failed. |
738 | * Still, if the _BCL package ordering is descending, the index of |
739 | * level 0 is also 100, so we assume _BQC is indexed, when it's not. |
740 | * |
741 | * This causes all _BQC calls to return bogus values causing weird |
742 | * behavior from the user's perspective. For example: |
743 | * |
744 | * xbacklight -set 10; xbacklight -set 20; |
745 | * |
746 | * would flash to 90% and then slowly down to the desired level (20). |
747 | * |
748 | * The solution is simple; test anything other than the first level |
749 | * (e.g. 1). |
750 | */ |
751 | test_level = current_level == max_level |
752 | ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1] |
753 | : max_level; |
754 | |
755 | result = acpi_video_device_lcd_set_level(device, level: test_level); |
756 | if (result) |
757 | return result; |
758 | |
759 | result = acpi_video_device_lcd_get_level_current(device, level: &level, raw: true); |
760 | if (result) |
761 | return result; |
762 | |
763 | if (level != test_level) { |
764 | /* buggy _BQC found, need to find out if it uses index */ |
765 | if (level < br->count) { |
766 | if (br->flags._BCL_reversed) |
767 | level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level; |
768 | if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level) |
769 | br->flags._BQC_use_index = 1; |
770 | } |
771 | |
772 | if (!br->flags._BQC_use_index) |
773 | device->cap._BQC = device->cap._BCQ = 0; |
774 | } |
775 | |
776 | return 0; |
777 | } |
778 | |
779 | int acpi_video_get_levels(struct acpi_device *device, |
780 | struct acpi_video_device_brightness **dev_br, |
781 | int *pmax_level) |
782 | { |
783 | union acpi_object *obj = NULL; |
784 | int i, max_level = 0, count = 0, level_ac_battery = 0; |
785 | union acpi_object *o; |
786 | struct acpi_video_device_brightness *br = NULL; |
787 | int result = 0; |
788 | u32 value; |
789 | |
790 | if (ACPI_FAILURE(acpi_video_device_lcd_query_levels(device->handle, &obj))) { |
791 | acpi_handle_debug(device->handle, |
792 | "Could not query available LCD brightness level\n" ); |
793 | result = -ENODEV; |
794 | goto out; |
795 | } |
796 | |
797 | if (obj->package.count < ACPI_VIDEO_FIRST_LEVEL) { |
798 | result = -EINVAL; |
799 | goto out; |
800 | } |
801 | |
802 | br = kzalloc(size: sizeof(*br), GFP_KERNEL); |
803 | if (!br) { |
804 | result = -ENOMEM; |
805 | goto out; |
806 | } |
807 | |
808 | /* |
809 | * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL), |
810 | * in order to account for buggy BIOS which don't export the first two |
811 | * special levels (see below) |
812 | */ |
813 | br->levels = kmalloc_array(n: obj->package.count + ACPI_VIDEO_FIRST_LEVEL, |
814 | size: sizeof(*br->levels), |
815 | GFP_KERNEL); |
816 | if (!br->levels) { |
817 | result = -ENOMEM; |
818 | goto out_free; |
819 | } |
820 | |
821 | for (i = 0; i < obj->package.count; i++) { |
822 | o = (union acpi_object *)&obj->package.elements[i]; |
823 | if (o->type != ACPI_TYPE_INTEGER) { |
824 | acpi_handle_info(device->handle, "Invalid data\n" ); |
825 | continue; |
826 | } |
827 | value = (u32) o->integer.value; |
828 | /* Skip duplicate entries */ |
829 | if (count > ACPI_VIDEO_FIRST_LEVEL |
830 | && br->levels[count - 1] == value) |
831 | continue; |
832 | |
833 | br->levels[count] = value; |
834 | |
835 | if (br->levels[count] > max_level) |
836 | max_level = br->levels[count]; |
837 | count++; |
838 | } |
839 | |
840 | /* |
841 | * some buggy BIOS don't export the levels |
842 | * when machine is on AC/Battery in _BCL package. |
843 | * In this case, the first two elements in _BCL packages |
844 | * are also supported brightness levels that OS should take care of. |
845 | */ |
846 | for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) { |
847 | if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL]) |
848 | level_ac_battery++; |
849 | if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL]) |
850 | level_ac_battery++; |
851 | } |
852 | |
853 | if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) { |
854 | level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery; |
855 | br->flags._BCL_no_ac_battery_levels = 1; |
856 | for (i = (count - 1 + level_ac_battery); |
857 | i >= ACPI_VIDEO_FIRST_LEVEL; i--) |
858 | br->levels[i] = br->levels[i - level_ac_battery]; |
859 | count += level_ac_battery; |
860 | } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL) |
861 | acpi_handle_info(device->handle, |
862 | "Too many duplicates in _BCL package" ); |
863 | |
864 | /* Check if the _BCL package is in a reversed order */ |
865 | if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) { |
866 | br->flags._BCL_reversed = 1; |
867 | sort(base: &br->levels[ACPI_VIDEO_FIRST_LEVEL], |
868 | num: count - ACPI_VIDEO_FIRST_LEVEL, |
869 | size: sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]), |
870 | cmp_func: acpi_video_cmp_level, NULL); |
871 | } else if (max_level != br->levels[count - 1]) |
872 | acpi_handle_info(device->handle, |
873 | "Found unordered _BCL package" ); |
874 | |
875 | br->count = count; |
876 | *dev_br = br; |
877 | if (pmax_level) |
878 | *pmax_level = max_level; |
879 | |
880 | out: |
881 | kfree(objp: obj); |
882 | return result; |
883 | out_free: |
884 | kfree(objp: br); |
885 | goto out; |
886 | } |
887 | EXPORT_SYMBOL(acpi_video_get_levels); |
888 | |
889 | /* |
890 | * Arg: |
891 | * device : video output device (LCD, CRT, ..) |
892 | * |
893 | * Return Value: |
894 | * Maximum brightness level |
895 | * |
896 | * Allocate and initialize device->brightness. |
897 | */ |
898 | |
899 | static int |
900 | acpi_video_init_brightness(struct acpi_video_device *device) |
901 | { |
902 | int i, max_level = 0; |
903 | unsigned long long level, level_old; |
904 | struct acpi_video_device_brightness *br = NULL; |
905 | int result; |
906 | |
907 | result = acpi_video_get_levels(device->dev, &br, &max_level); |
908 | if (result) |
909 | return result; |
910 | device->brightness = br; |
911 | |
912 | /* _BQC uses INDEX while _BCL uses VALUE in some laptops */ |
913 | br->curr = level = max_level; |
914 | |
915 | if (!device->cap._BQC) |
916 | goto set_level; |
917 | |
918 | result = acpi_video_device_lcd_get_level_current(device, |
919 | level: &level_old, raw: true); |
920 | if (result) |
921 | goto out_free_levels; |
922 | |
923 | result = acpi_video_bqc_quirk(device, max_level, current_level: level_old); |
924 | if (result) |
925 | goto out_free_levels; |
926 | /* |
927 | * cap._BQC may get cleared due to _BQC is found to be broken |
928 | * in acpi_video_bqc_quirk, so check again here. |
929 | */ |
930 | if (!device->cap._BQC) |
931 | goto set_level; |
932 | |
933 | level = acpi_video_bqc_value_to_level(device, bqc_value: level_old); |
934 | /* |
935 | * On some buggy laptops, _BQC returns an uninitialized |
936 | * value when invoked for the first time, i.e. |
937 | * level_old is invalid (no matter whether it's a level |
938 | * or an index). Set the backlight to max_level in this case. |
939 | */ |
940 | for (i = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++) |
941 | if (level == br->levels[i]) |
942 | break; |
943 | if (i == br->count || !level) |
944 | level = max_level; |
945 | |
946 | set_level: |
947 | result = acpi_video_device_lcd_set_level(device, level); |
948 | if (result) |
949 | goto out_free_levels; |
950 | |
951 | acpi_handle_debug(device->dev->handle, "found %d brightness levels\n" , |
952 | br->count - ACPI_VIDEO_FIRST_LEVEL); |
953 | |
954 | return 0; |
955 | |
956 | out_free_levels: |
957 | kfree(objp: br->levels); |
958 | kfree(objp: br); |
959 | device->brightness = NULL; |
960 | return result; |
961 | } |
962 | |
963 | /* |
964 | * Arg: |
965 | * device : video output device (LCD, CRT, ..) |
966 | * |
967 | * Return Value: |
968 | * None |
969 | * |
970 | * Find out all required AML methods defined under the output |
971 | * device. |
972 | */ |
973 | |
974 | static void acpi_video_device_find_cap(struct acpi_video_device *device) |
975 | { |
976 | if (acpi_has_method(handle: device->dev->handle, name: "_ADR" )) |
977 | device->cap._ADR = 1; |
978 | if (acpi_has_method(handle: device->dev->handle, name: "_BCL" )) |
979 | device->cap._BCL = 1; |
980 | if (acpi_has_method(handle: device->dev->handle, name: "_BCM" )) |
981 | device->cap._BCM = 1; |
982 | if (acpi_has_method(handle: device->dev->handle, name: "_BQC" )) { |
983 | device->cap._BQC = 1; |
984 | } else if (acpi_has_method(handle: device->dev->handle, name: "_BCQ" )) { |
985 | acpi_handle_info(device->dev->handle, |
986 | "_BCQ is used instead of _BQC\n" ); |
987 | device->cap._BCQ = 1; |
988 | } |
989 | |
990 | if (acpi_has_method(handle: device->dev->handle, name: "_DDC" )) |
991 | device->cap._DDC = 1; |
992 | } |
993 | |
994 | /* |
995 | * Arg: |
996 | * device : video output device (VGA) |
997 | * |
998 | * Return Value: |
999 | * None |
1000 | * |
1001 | * Find out all required AML methods defined under the video bus device. |
1002 | */ |
1003 | |
1004 | static void acpi_video_bus_find_cap(struct acpi_video_bus *video) |
1005 | { |
1006 | if (acpi_has_method(handle: video->device->handle, name: "_DOS" )) |
1007 | video->cap._DOS = 1; |
1008 | if (acpi_has_method(handle: video->device->handle, name: "_DOD" )) |
1009 | video->cap._DOD = 1; |
1010 | if (acpi_has_method(handle: video->device->handle, name: "_ROM" )) |
1011 | video->cap._ROM = 1; |
1012 | if (acpi_has_method(handle: video->device->handle, name: "_GPD" )) |
1013 | video->cap._GPD = 1; |
1014 | if (acpi_has_method(handle: video->device->handle, name: "_SPD" )) |
1015 | video->cap._SPD = 1; |
1016 | if (acpi_has_method(handle: video->device->handle, name: "_VPO" )) |
1017 | video->cap._VPO = 1; |
1018 | } |
1019 | |
1020 | /* |
1021 | * Check whether the video bus device has required AML method to |
1022 | * support the desired features |
1023 | */ |
1024 | |
1025 | static int acpi_video_bus_check(struct acpi_video_bus *video) |
1026 | { |
1027 | acpi_status status = -ENOENT; |
1028 | struct pci_dev *dev; |
1029 | |
1030 | if (!video) |
1031 | return -EINVAL; |
1032 | |
1033 | dev = acpi_get_pci_dev(video->device->handle); |
1034 | if (!dev) |
1035 | return -ENODEV; |
1036 | pci_dev_put(dev); |
1037 | |
1038 | /* |
1039 | * Since there is no HID, CID and so on for VGA driver, we have |
1040 | * to check well known required nodes. |
1041 | */ |
1042 | |
1043 | /* Does this device support video switching? */ |
1044 | if (video->cap._DOS || video->cap._DOD) { |
1045 | if (!video->cap._DOS) { |
1046 | pr_info(FW_BUG "ACPI(%s) defines _DOD but not _DOS\n" , |
1047 | acpi_device_bid(video->device)); |
1048 | } |
1049 | video->flags.multihead = 1; |
1050 | status = 0; |
1051 | } |
1052 | |
1053 | /* Does this device support retrieving a video ROM? */ |
1054 | if (video->cap._ROM) { |
1055 | video->flags.rom = 1; |
1056 | status = 0; |
1057 | } |
1058 | |
1059 | /* Does this device support configuring which video device to POST? */ |
1060 | if (video->cap._GPD && video->cap._SPD && video->cap._VPO) { |
1061 | video->flags.post = 1; |
1062 | status = 0; |
1063 | } |
1064 | |
1065 | return status; |
1066 | } |
1067 | |
1068 | /* |
1069 | * -------------------------------------------------------------------------- |
1070 | * Driver Interface |
1071 | * -------------------------------------------------------------------------- |
1072 | */ |
1073 | |
1074 | /* device interface */ |
1075 | static struct acpi_video_device_attrib * |
1076 | acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id) |
1077 | { |
1078 | struct acpi_video_enumerated_device *ids; |
1079 | int i; |
1080 | |
1081 | for (i = 0; i < video->attached_count; i++) { |
1082 | ids = &video->attached_array[i]; |
1083 | if ((ids->value.int_val & 0xffff) == device_id) |
1084 | return &ids->value.attrib; |
1085 | } |
1086 | |
1087 | return NULL; |
1088 | } |
1089 | |
1090 | static int |
1091 | acpi_video_get_device_type(struct acpi_video_bus *video, |
1092 | unsigned long device_id) |
1093 | { |
1094 | struct acpi_video_enumerated_device *ids; |
1095 | int i; |
1096 | |
1097 | for (i = 0; i < video->attached_count; i++) { |
1098 | ids = &video->attached_array[i]; |
1099 | if ((ids->value.int_val & 0xffff) == device_id) |
1100 | return ids->value.int_val; |
1101 | } |
1102 | |
1103 | return 0; |
1104 | } |
1105 | |
1106 | static int acpi_video_bus_get_one_device(struct acpi_device *device, void *arg) |
1107 | { |
1108 | struct acpi_video_bus *video = arg; |
1109 | struct acpi_video_device_attrib *attribute; |
1110 | struct acpi_video_device *data; |
1111 | unsigned long long device_id; |
1112 | acpi_status status; |
1113 | int device_type; |
1114 | |
1115 | status = acpi_evaluate_integer(handle: device->handle, pathname: "_ADR" , NULL, data: &device_id); |
1116 | /* Skip devices without _ADR instead of failing. */ |
1117 | if (ACPI_FAILURE(status)) |
1118 | goto exit; |
1119 | |
1120 | data = kzalloc(size: sizeof(struct acpi_video_device), GFP_KERNEL); |
1121 | if (!data) { |
1122 | dev_dbg(&device->dev, "Cannot attach\n" ); |
1123 | return -ENOMEM; |
1124 | } |
1125 | |
1126 | strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME); |
1127 | strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); |
1128 | device->driver_data = data; |
1129 | |
1130 | data->device_id = device_id; |
1131 | data->video = video; |
1132 | data->dev = device; |
1133 | INIT_DELAYED_WORK(&data->switch_brightness_work, |
1134 | acpi_video_switch_brightness); |
1135 | |
1136 | attribute = acpi_video_get_device_attr(video, device_id); |
1137 | |
1138 | if (attribute && (attribute->device_id_scheme || device_id_scheme)) { |
1139 | switch (attribute->display_type) { |
1140 | case ACPI_VIDEO_DISPLAY_CRT: |
1141 | data->flags.crt = 1; |
1142 | break; |
1143 | case ACPI_VIDEO_DISPLAY_TV: |
1144 | data->flags.tvout = 1; |
1145 | break; |
1146 | case ACPI_VIDEO_DISPLAY_DVI: |
1147 | data->flags.dvi = 1; |
1148 | break; |
1149 | case ACPI_VIDEO_DISPLAY_LCD: |
1150 | data->flags.lcd = 1; |
1151 | break; |
1152 | default: |
1153 | data->flags.unknown = 1; |
1154 | break; |
1155 | } |
1156 | if (attribute->bios_can_detect) |
1157 | data->flags.bios = 1; |
1158 | } else { |
1159 | /* Check for legacy IDs */ |
1160 | device_type = acpi_video_get_device_type(video, device_id); |
1161 | /* Ignore bits 16 and 18-20 */ |
1162 | switch (device_type & 0xffe2ffff) { |
1163 | case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR: |
1164 | data->flags.crt = 1; |
1165 | break; |
1166 | case ACPI_VIDEO_DISPLAY_LEGACY_PANEL: |
1167 | data->flags.lcd = 1; |
1168 | break; |
1169 | case ACPI_VIDEO_DISPLAY_LEGACY_TV: |
1170 | data->flags.tvout = 1; |
1171 | break; |
1172 | default: |
1173 | data->flags.unknown = 1; |
1174 | } |
1175 | } |
1176 | |
1177 | acpi_video_device_bind(video, device: data); |
1178 | acpi_video_device_find_cap(device: data); |
1179 | |
1180 | if (data->cap._BCM && data->cap._BCL) |
1181 | may_report_brightness_keys = true; |
1182 | |
1183 | mutex_lock(&video->device_list_lock); |
1184 | list_add_tail(new: &data->entry, head: &video->video_device_list); |
1185 | mutex_unlock(lock: &video->device_list_lock); |
1186 | |
1187 | exit: |
1188 | video->child_count++; |
1189 | return 0; |
1190 | } |
1191 | |
1192 | /* |
1193 | * Arg: |
1194 | * video : video bus device |
1195 | * |
1196 | * Return: |
1197 | * none |
1198 | * |
1199 | * Enumerate the video device list of the video bus, |
1200 | * bind the ids with the corresponding video devices |
1201 | * under the video bus. |
1202 | */ |
1203 | |
1204 | static void acpi_video_device_rebind(struct acpi_video_bus *video) |
1205 | { |
1206 | struct acpi_video_device *dev; |
1207 | |
1208 | mutex_lock(&video->device_list_lock); |
1209 | |
1210 | list_for_each_entry(dev, &video->video_device_list, entry) |
1211 | acpi_video_device_bind(video, device: dev); |
1212 | |
1213 | mutex_unlock(lock: &video->device_list_lock); |
1214 | } |
1215 | |
1216 | /* |
1217 | * Arg: |
1218 | * video : video bus device |
1219 | * device : video output device under the video |
1220 | * bus |
1221 | * |
1222 | * Return: |
1223 | * none |
1224 | * |
1225 | * Bind the ids with the corresponding video devices |
1226 | * under the video bus. |
1227 | */ |
1228 | |
1229 | static void |
1230 | acpi_video_device_bind(struct acpi_video_bus *video, |
1231 | struct acpi_video_device *device) |
1232 | { |
1233 | struct acpi_video_enumerated_device *ids; |
1234 | int i; |
1235 | |
1236 | for (i = 0; i < video->attached_count; i++) { |
1237 | ids = &video->attached_array[i]; |
1238 | if (device->device_id == (ids->value.int_val & 0xffff)) { |
1239 | ids->bind_info = device; |
1240 | acpi_handle_debug(video->device->handle, "%s: %d\n" , |
1241 | __func__, i); |
1242 | } |
1243 | } |
1244 | } |
1245 | |
1246 | static bool acpi_video_device_in_dod(struct acpi_video_device *device) |
1247 | { |
1248 | struct acpi_video_bus *video = device->video; |
1249 | int i; |
1250 | |
1251 | /* |
1252 | * If we have a broken _DOD or we have more than 8 output devices |
1253 | * under the graphics controller node that we can't proper deal with |
1254 | * in the operation region code currently, no need to test. |
1255 | */ |
1256 | if (!video->attached_count || video->child_count > 8) |
1257 | return true; |
1258 | |
1259 | for (i = 0; i < video->attached_count; i++) { |
1260 | if ((video->attached_array[i].value.int_val & 0xfff) == |
1261 | (device->device_id & 0xfff)) |
1262 | return true; |
1263 | } |
1264 | |
1265 | return false; |
1266 | } |
1267 | |
1268 | /* |
1269 | * Arg: |
1270 | * video : video bus device |
1271 | * |
1272 | * Return: |
1273 | * < 0 : error |
1274 | * |
1275 | * Call _DOD to enumerate all devices attached to display adapter |
1276 | * |
1277 | */ |
1278 | |
1279 | static int acpi_video_device_enumerate(struct acpi_video_bus *video) |
1280 | { |
1281 | int status; |
1282 | int count; |
1283 | int i; |
1284 | struct acpi_video_enumerated_device *active_list; |
1285 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
1286 | union acpi_object *dod = NULL; |
1287 | union acpi_object *obj; |
1288 | |
1289 | if (!video->cap._DOD) |
1290 | return AE_NOT_EXIST; |
1291 | |
1292 | status = acpi_evaluate_object(object: video->device->handle, pathname: "_DOD" , NULL, return_object_buffer: &buffer); |
1293 | if (ACPI_FAILURE(status)) { |
1294 | acpi_handle_info(video->device->handle, |
1295 | "_DOD evaluation failed: %s\n" , |
1296 | acpi_format_exception(status)); |
1297 | return status; |
1298 | } |
1299 | |
1300 | dod = buffer.pointer; |
1301 | if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) { |
1302 | acpi_handle_info(video->device->handle, "Invalid _DOD data\n" ); |
1303 | status = -EFAULT; |
1304 | goto out; |
1305 | } |
1306 | |
1307 | acpi_handle_debug(video->device->handle, "Found %d video heads in _DOD\n" , |
1308 | dod->package.count); |
1309 | |
1310 | active_list = kcalloc(n: 1 + dod->package.count, |
1311 | size: sizeof(struct acpi_video_enumerated_device), |
1312 | GFP_KERNEL); |
1313 | if (!active_list) { |
1314 | status = -ENOMEM; |
1315 | goto out; |
1316 | } |
1317 | |
1318 | count = 0; |
1319 | for (i = 0; i < dod->package.count; i++) { |
1320 | obj = &dod->package.elements[i]; |
1321 | |
1322 | if (obj->type != ACPI_TYPE_INTEGER) { |
1323 | acpi_handle_info(video->device->handle, |
1324 | "Invalid _DOD data in element %d\n" , i); |
1325 | continue; |
1326 | } |
1327 | |
1328 | active_list[count].value.int_val = obj->integer.value; |
1329 | active_list[count].bind_info = NULL; |
1330 | |
1331 | acpi_handle_debug(video->device->handle, |
1332 | "_DOD element[%d] = %d\n" , i, |
1333 | (int)obj->integer.value); |
1334 | |
1335 | count++; |
1336 | } |
1337 | |
1338 | kfree(objp: video->attached_array); |
1339 | |
1340 | video->attached_array = active_list; |
1341 | video->attached_count = count; |
1342 | |
1343 | out: |
1344 | kfree(objp: buffer.pointer); |
1345 | return status; |
1346 | } |
1347 | |
1348 | static int |
1349 | acpi_video_get_next_level(struct acpi_video_device *device, |
1350 | u32 level_current, u32 event) |
1351 | { |
1352 | int min, max, min_above, max_below, i, l, delta = 255; |
1353 | max = max_below = 0; |
1354 | min = min_above = 255; |
1355 | /* Find closest level to level_current */ |
1356 | for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { |
1357 | l = device->brightness->levels[i]; |
1358 | if (abs(l - level_current) < abs(delta)) { |
1359 | delta = l - level_current; |
1360 | if (!delta) |
1361 | break; |
1362 | } |
1363 | } |
1364 | /* Adjust level_current to closest available level */ |
1365 | level_current += delta; |
1366 | for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { |
1367 | l = device->brightness->levels[i]; |
1368 | if (l < min) |
1369 | min = l; |
1370 | if (l > max) |
1371 | max = l; |
1372 | if (l < min_above && l > level_current) |
1373 | min_above = l; |
1374 | if (l > max_below && l < level_current) |
1375 | max_below = l; |
1376 | } |
1377 | |
1378 | switch (event) { |
1379 | case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: |
1380 | return (level_current < max) ? min_above : min; |
1381 | case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: |
1382 | return (level_current < max) ? min_above : max; |
1383 | case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: |
1384 | return (level_current > min) ? max_below : min; |
1385 | case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: |
1386 | case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: |
1387 | return 0; |
1388 | default: |
1389 | return level_current; |
1390 | } |
1391 | } |
1392 | |
1393 | static void |
1394 | acpi_video_switch_brightness(struct work_struct *work) |
1395 | { |
1396 | struct acpi_video_device *device = container_of(to_delayed_work(work), |
1397 | struct acpi_video_device, switch_brightness_work); |
1398 | unsigned long long level_current, level_next; |
1399 | int event = device->switch_brightness_event; |
1400 | int result = -EINVAL; |
1401 | |
1402 | /* no warning message if acpi_backlight=vendor or a quirk is used */ |
1403 | if (!device->backlight) |
1404 | return; |
1405 | |
1406 | if (!device->brightness) |
1407 | goto out; |
1408 | |
1409 | result = acpi_video_device_lcd_get_level_current(device, |
1410 | level: &level_current, |
1411 | raw: false); |
1412 | if (result) |
1413 | goto out; |
1414 | |
1415 | level_next = acpi_video_get_next_level(device, level_current, event); |
1416 | |
1417 | result = acpi_video_device_lcd_set_level(device, level: level_next); |
1418 | |
1419 | if (!result) |
1420 | backlight_force_update(bd: device->backlight, |
1421 | reason: BACKLIGHT_UPDATE_HOTKEY); |
1422 | |
1423 | out: |
1424 | if (result) |
1425 | acpi_handle_info(device->dev->handle, |
1426 | "Failed to switch brightness\n" ); |
1427 | } |
1428 | |
1429 | int acpi_video_get_edid(struct acpi_device *device, int type, int device_id, |
1430 | void **edid) |
1431 | { |
1432 | struct acpi_video_bus *video; |
1433 | struct acpi_video_device *video_device; |
1434 | union acpi_object *buffer = NULL; |
1435 | acpi_status status; |
1436 | int i, length; |
1437 | |
1438 | if (!device || !acpi_driver_data(d: device)) |
1439 | return -EINVAL; |
1440 | |
1441 | video = acpi_driver_data(d: device); |
1442 | |
1443 | for (i = 0; i < video->attached_count; i++) { |
1444 | video_device = video->attached_array[i].bind_info; |
1445 | length = 256; |
1446 | |
1447 | if (!video_device) |
1448 | continue; |
1449 | |
1450 | if (!video_device->cap._DDC) |
1451 | continue; |
1452 | |
1453 | if (type) { |
1454 | switch (type) { |
1455 | case ACPI_VIDEO_DISPLAY_CRT: |
1456 | if (!video_device->flags.crt) |
1457 | continue; |
1458 | break; |
1459 | case ACPI_VIDEO_DISPLAY_TV: |
1460 | if (!video_device->flags.tvout) |
1461 | continue; |
1462 | break; |
1463 | case ACPI_VIDEO_DISPLAY_DVI: |
1464 | if (!video_device->flags.dvi) |
1465 | continue; |
1466 | break; |
1467 | case ACPI_VIDEO_DISPLAY_LCD: |
1468 | if (!video_device->flags.lcd) |
1469 | continue; |
1470 | break; |
1471 | } |
1472 | } else if (video_device->device_id != device_id) { |
1473 | continue; |
1474 | } |
1475 | |
1476 | status = acpi_video_device_EDID(device: video_device, edid: &buffer, length); |
1477 | |
1478 | if (ACPI_FAILURE(status) || !buffer || |
1479 | buffer->type != ACPI_TYPE_BUFFER) { |
1480 | length = 128; |
1481 | status = acpi_video_device_EDID(device: video_device, edid: &buffer, |
1482 | length); |
1483 | if (ACPI_FAILURE(status) || !buffer || |
1484 | buffer->type != ACPI_TYPE_BUFFER) { |
1485 | continue; |
1486 | } |
1487 | } |
1488 | |
1489 | *edid = buffer->buffer.pointer; |
1490 | return length; |
1491 | } |
1492 | |
1493 | return -ENODEV; |
1494 | } |
1495 | EXPORT_SYMBOL(acpi_video_get_edid); |
1496 | |
1497 | static int |
1498 | acpi_video_bus_get_devices(struct acpi_video_bus *video, |
1499 | struct acpi_device *device) |
1500 | { |
1501 | /* |
1502 | * There are systems where video module known to work fine regardless |
1503 | * of broken _DOD and ignoring returned value here doesn't cause |
1504 | * any issues later. |
1505 | */ |
1506 | acpi_video_device_enumerate(video); |
1507 | |
1508 | return acpi_dev_for_each_child(adev: device, fn: acpi_video_bus_get_one_device, data: video); |
1509 | } |
1510 | |
1511 | /* acpi_video interface */ |
1512 | |
1513 | /* |
1514 | * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't |
1515 | * perform any automatic brightness change on receiving a notification. |
1516 | */ |
1517 | static int acpi_video_bus_start_devices(struct acpi_video_bus *video) |
1518 | { |
1519 | return acpi_video_bus_DOS(video, bios_flag: 0, |
1520 | lcd_flag: acpi_osi_is_win8() ? 1 : 0); |
1521 | } |
1522 | |
1523 | static int acpi_video_bus_stop_devices(struct acpi_video_bus *video) |
1524 | { |
1525 | return acpi_video_bus_DOS(video, bios_flag: 0, |
1526 | lcd_flag: acpi_osi_is_win8() ? 0 : 1); |
1527 | } |
1528 | |
1529 | static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data) |
1530 | { |
1531 | struct acpi_device *device = data; |
1532 | struct acpi_video_bus *video = acpi_driver_data(d: device); |
1533 | struct input_dev *input; |
1534 | int keycode = 0; |
1535 | |
1536 | if (!video || !video->input) |
1537 | return; |
1538 | |
1539 | input = video->input; |
1540 | |
1541 | switch (event) { |
1542 | case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch, |
1543 | * most likely via hotkey. */ |
1544 | keycode = KEY_SWITCHVIDEOMODE; |
1545 | break; |
1546 | |
1547 | case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video |
1548 | * connector. */ |
1549 | acpi_video_device_enumerate(video); |
1550 | acpi_video_device_rebind(video); |
1551 | keycode = KEY_SWITCHVIDEOMODE; |
1552 | break; |
1553 | |
1554 | case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */ |
1555 | keycode = KEY_SWITCHVIDEOMODE; |
1556 | break; |
1557 | case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */ |
1558 | keycode = KEY_VIDEO_NEXT; |
1559 | break; |
1560 | case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */ |
1561 | keycode = KEY_VIDEO_PREV; |
1562 | break; |
1563 | |
1564 | default: |
1565 | acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n" , |
1566 | event); |
1567 | break; |
1568 | } |
1569 | |
1570 | if (acpi_notifier_call_chain(device, event, 0)) |
1571 | /* Something vetoed the keypress. */ |
1572 | keycode = 0; |
1573 | |
1574 | if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) { |
1575 | input_report_key(dev: input, code: keycode, value: 1); |
1576 | input_sync(dev: input); |
1577 | input_report_key(dev: input, code: keycode, value: 0); |
1578 | input_sync(dev: input); |
1579 | } |
1580 | } |
1581 | |
1582 | static void brightness_switch_event(struct acpi_video_device *video_device, |
1583 | u32 event) |
1584 | { |
1585 | if (!brightness_switch_enabled) |
1586 | return; |
1587 | |
1588 | video_device->switch_brightness_event = event; |
1589 | schedule_delayed_work(dwork: &video_device->switch_brightness_work, HZ / 10); |
1590 | } |
1591 | |
1592 | static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data) |
1593 | { |
1594 | struct acpi_video_device *video_device = data; |
1595 | struct acpi_device *device = NULL; |
1596 | struct acpi_video_bus *bus; |
1597 | struct input_dev *input; |
1598 | int keycode = 0; |
1599 | |
1600 | if (!video_device) |
1601 | return; |
1602 | |
1603 | device = video_device->dev; |
1604 | bus = video_device->video; |
1605 | input = bus->input; |
1606 | |
1607 | if (hw_changes_brightness > 0) { |
1608 | if (video_device->backlight) |
1609 | backlight_force_update(bd: video_device->backlight, |
1610 | reason: BACKLIGHT_UPDATE_HOTKEY); |
1611 | acpi_notifier_call_chain(device, event, 0); |
1612 | return; |
1613 | } |
1614 | |
1615 | switch (event) { |
1616 | case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */ |
1617 | brightness_switch_event(video_device, event); |
1618 | keycode = KEY_BRIGHTNESS_CYCLE; |
1619 | break; |
1620 | case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */ |
1621 | brightness_switch_event(video_device, event); |
1622 | keycode = KEY_BRIGHTNESSUP; |
1623 | break; |
1624 | case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */ |
1625 | brightness_switch_event(video_device, event); |
1626 | keycode = KEY_BRIGHTNESSDOWN; |
1627 | break; |
1628 | case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */ |
1629 | brightness_switch_event(video_device, event); |
1630 | keycode = KEY_BRIGHTNESS_ZERO; |
1631 | break; |
1632 | case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */ |
1633 | brightness_switch_event(video_device, event); |
1634 | keycode = KEY_DISPLAY_OFF; |
1635 | break; |
1636 | default: |
1637 | acpi_handle_debug(handle, "Unsupported event [0x%x]\n" , event); |
1638 | break; |
1639 | } |
1640 | |
1641 | if (keycode) |
1642 | may_report_brightness_keys = true; |
1643 | |
1644 | acpi_notifier_call_chain(device, event, 0); |
1645 | |
1646 | if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) { |
1647 | input_report_key(dev: input, code: keycode, value: 1); |
1648 | input_sync(dev: input); |
1649 | input_report_key(dev: input, code: keycode, value: 0); |
1650 | input_sync(dev: input); |
1651 | } |
1652 | } |
1653 | |
1654 | static int acpi_video_resume(struct notifier_block *nb, |
1655 | unsigned long val, void *ign) |
1656 | { |
1657 | struct acpi_video_bus *video; |
1658 | struct acpi_video_device *video_device; |
1659 | int i; |
1660 | |
1661 | switch (val) { |
1662 | case PM_POST_HIBERNATION: |
1663 | case PM_POST_SUSPEND: |
1664 | case PM_POST_RESTORE: |
1665 | video = container_of(nb, struct acpi_video_bus, pm_nb); |
1666 | |
1667 | dev_info(&video->device->dev, "Restoring backlight state\n" ); |
1668 | |
1669 | for (i = 0; i < video->attached_count; i++) { |
1670 | video_device = video->attached_array[i].bind_info; |
1671 | if (video_device && video_device->brightness) |
1672 | acpi_video_device_lcd_set_level(device: video_device, |
1673 | level: video_device->brightness->curr); |
1674 | } |
1675 | |
1676 | return NOTIFY_OK; |
1677 | } |
1678 | return NOTIFY_DONE; |
1679 | } |
1680 | |
1681 | static acpi_status |
1682 | acpi_video_bus_match(acpi_handle handle, u32 level, void *context, |
1683 | void **return_value) |
1684 | { |
1685 | struct acpi_device *device = context; |
1686 | struct acpi_device *sibling; |
1687 | |
1688 | if (handle == device->handle) |
1689 | return AE_CTRL_TERMINATE; |
1690 | |
1691 | sibling = acpi_fetch_acpi_dev(handle); |
1692 | if (!sibling) |
1693 | return AE_OK; |
1694 | |
1695 | if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME)) |
1696 | return AE_ALREADY_EXISTS; |
1697 | |
1698 | return AE_OK; |
1699 | } |
1700 | |
1701 | static void acpi_video_dev_register_backlight(struct acpi_video_device *device) |
1702 | { |
1703 | struct backlight_properties props; |
1704 | struct pci_dev *pdev; |
1705 | acpi_handle acpi_parent; |
1706 | struct device *parent = NULL; |
1707 | int result; |
1708 | static int count; |
1709 | char *name; |
1710 | |
1711 | result = acpi_video_init_brightness(device); |
1712 | if (result) |
1713 | return; |
1714 | |
1715 | name = kasprintf(GFP_KERNEL, fmt: "acpi_video%d" , count); |
1716 | if (!name) |
1717 | return; |
1718 | count++; |
1719 | |
1720 | acpi_get_parent(object: device->dev->handle, out_handle: &acpi_parent); |
1721 | |
1722 | pdev = acpi_get_pci_dev(acpi_parent); |
1723 | if (pdev) { |
1724 | parent = &pdev->dev; |
1725 | pci_dev_put(dev: pdev); |
1726 | } |
1727 | |
1728 | memset(&props, 0, sizeof(struct backlight_properties)); |
1729 | props.type = BACKLIGHT_FIRMWARE; |
1730 | props.max_brightness = |
1731 | device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1; |
1732 | device->backlight = backlight_device_register(name, |
1733 | dev: parent, |
1734 | devdata: device, |
1735 | ops: &acpi_backlight_ops, |
1736 | props: &props); |
1737 | kfree(objp: name); |
1738 | if (IS_ERR(ptr: device->backlight)) { |
1739 | device->backlight = NULL; |
1740 | return; |
1741 | } |
1742 | |
1743 | /* |
1744 | * Save current brightness level in case we have to restore it |
1745 | * before acpi_video_device_lcd_set_level() is called next time. |
1746 | */ |
1747 | device->backlight->props.brightness = |
1748 | acpi_video_get_brightness(bd: device->backlight); |
1749 | |
1750 | device->cooling_dev = thermal_cooling_device_register("LCD" , |
1751 | device->dev, &video_cooling_ops); |
1752 | if (IS_ERR(ptr: device->cooling_dev)) { |
1753 | /* |
1754 | * Set cooling_dev to NULL so we don't crash trying to free it. |
1755 | * Also, why the hell we are returning early and not attempt to |
1756 | * register video output if cooling device registration failed? |
1757 | * -- dtor |
1758 | */ |
1759 | device->cooling_dev = NULL; |
1760 | return; |
1761 | } |
1762 | |
1763 | dev_info(&device->dev->dev, "registered as cooling_device%d\n" , |
1764 | device->cooling_dev->id); |
1765 | result = sysfs_create_link(kobj: &device->dev->dev.kobj, |
1766 | target: &device->cooling_dev->device.kobj, |
1767 | name: "thermal_cooling" ); |
1768 | if (result) |
1769 | pr_info("sysfs link creation failed\n" ); |
1770 | |
1771 | result = sysfs_create_link(kobj: &device->cooling_dev->device.kobj, |
1772 | target: &device->dev->dev.kobj, name: "device" ); |
1773 | if (result) |
1774 | pr_info("Reverse sysfs link creation failed\n" ); |
1775 | } |
1776 | |
1777 | static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video) |
1778 | { |
1779 | struct acpi_video_device *dev; |
1780 | union acpi_object *levels; |
1781 | |
1782 | mutex_lock(&video->device_list_lock); |
1783 | list_for_each_entry(dev, &video->video_device_list, entry) { |
1784 | if (!acpi_video_device_lcd_query_levels(handle: dev->dev->handle, levels: &levels)) |
1785 | kfree(objp: levels); |
1786 | } |
1787 | mutex_unlock(lock: &video->device_list_lock); |
1788 | } |
1789 | |
1790 | static bool acpi_video_should_register_backlight(struct acpi_video_device *dev) |
1791 | { |
1792 | /* |
1793 | * Do not create backlight device for video output |
1794 | * device that is not in the enumerated list. |
1795 | */ |
1796 | if (!acpi_video_device_in_dod(device: dev)) { |
1797 | dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n" ); |
1798 | return false; |
1799 | } |
1800 | |
1801 | if (only_lcd) |
1802 | return dev->flags.lcd; |
1803 | return true; |
1804 | } |
1805 | |
1806 | static int acpi_video_bus_register_backlight(struct acpi_video_bus *video) |
1807 | { |
1808 | struct acpi_video_device *dev; |
1809 | |
1810 | if (video->backlight_registered) |
1811 | return 0; |
1812 | |
1813 | if (acpi_video_get_backlight_type() != acpi_backlight_video) |
1814 | return 0; |
1815 | |
1816 | mutex_lock(&video->device_list_lock); |
1817 | list_for_each_entry(dev, &video->video_device_list, entry) { |
1818 | if (acpi_video_should_register_backlight(dev)) |
1819 | acpi_video_dev_register_backlight(device: dev); |
1820 | } |
1821 | mutex_unlock(lock: &video->device_list_lock); |
1822 | |
1823 | video->backlight_registered = true; |
1824 | |
1825 | video->pm_nb.notifier_call = acpi_video_resume; |
1826 | video->pm_nb.priority = 0; |
1827 | return register_pm_notifier(nb: &video->pm_nb); |
1828 | } |
1829 | |
1830 | static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device) |
1831 | { |
1832 | if (device->backlight) { |
1833 | backlight_device_unregister(bd: device->backlight); |
1834 | device->backlight = NULL; |
1835 | } |
1836 | if (device->brightness) { |
1837 | kfree(objp: device->brightness->levels); |
1838 | kfree(objp: device->brightness); |
1839 | device->brightness = NULL; |
1840 | } |
1841 | if (device->cooling_dev) { |
1842 | sysfs_remove_link(kobj: &device->dev->dev.kobj, name: "thermal_cooling" ); |
1843 | sysfs_remove_link(kobj: &device->cooling_dev->device.kobj, name: "device" ); |
1844 | thermal_cooling_device_unregister(device->cooling_dev); |
1845 | device->cooling_dev = NULL; |
1846 | } |
1847 | } |
1848 | |
1849 | static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video) |
1850 | { |
1851 | struct acpi_video_device *dev; |
1852 | int error; |
1853 | |
1854 | if (!video->backlight_registered) |
1855 | return 0; |
1856 | |
1857 | error = unregister_pm_notifier(nb: &video->pm_nb); |
1858 | |
1859 | mutex_lock(&video->device_list_lock); |
1860 | list_for_each_entry(dev, &video->video_device_list, entry) |
1861 | acpi_video_dev_unregister_backlight(device: dev); |
1862 | mutex_unlock(lock: &video->device_list_lock); |
1863 | |
1864 | video->backlight_registered = false; |
1865 | |
1866 | return error; |
1867 | } |
1868 | |
1869 | static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device) |
1870 | { |
1871 | acpi_status status; |
1872 | struct acpi_device *adev = device->dev; |
1873 | |
1874 | status = acpi_install_notify_handler(device: adev->handle, ACPI_DEVICE_NOTIFY, |
1875 | handler: acpi_video_device_notify, context: device); |
1876 | if (ACPI_FAILURE(status)) |
1877 | dev_err(&adev->dev, "Error installing notify handler\n" ); |
1878 | else |
1879 | device->flags.notify = 1; |
1880 | } |
1881 | |
1882 | static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video) |
1883 | { |
1884 | struct input_dev *input; |
1885 | struct acpi_video_device *dev; |
1886 | int error; |
1887 | |
1888 | video->input = input = input_allocate_device(); |
1889 | if (!input) { |
1890 | error = -ENOMEM; |
1891 | goto out; |
1892 | } |
1893 | |
1894 | error = acpi_video_bus_start_devices(video); |
1895 | if (error) |
1896 | goto err_free_input; |
1897 | |
1898 | snprintf(buf: video->phys, size: sizeof(video->phys), |
1899 | fmt: "%s/video/input0" , acpi_device_hid(device: video->device)); |
1900 | |
1901 | input->name = acpi_device_name(video->device); |
1902 | input->phys = video->phys; |
1903 | input->id.bustype = BUS_HOST; |
1904 | input->id.product = 0x06; |
1905 | input->dev.parent = &video->device->dev; |
1906 | input->evbit[0] = BIT(EV_KEY); |
1907 | set_bit(KEY_SWITCHVIDEOMODE, addr: input->keybit); |
1908 | set_bit(KEY_VIDEO_NEXT, addr: input->keybit); |
1909 | set_bit(KEY_VIDEO_PREV, addr: input->keybit); |
1910 | set_bit(KEY_BRIGHTNESS_CYCLE, addr: input->keybit); |
1911 | set_bit(KEY_BRIGHTNESSUP, addr: input->keybit); |
1912 | set_bit(KEY_BRIGHTNESSDOWN, addr: input->keybit); |
1913 | set_bit(KEY_BRIGHTNESS_ZERO, addr: input->keybit); |
1914 | set_bit(KEY_DISPLAY_OFF, addr: input->keybit); |
1915 | |
1916 | error = input_register_device(input); |
1917 | if (error) |
1918 | goto err_stop_dev; |
1919 | |
1920 | mutex_lock(&video->device_list_lock); |
1921 | list_for_each_entry(dev, &video->video_device_list, entry) |
1922 | acpi_video_dev_add_notify_handler(device: dev); |
1923 | mutex_unlock(lock: &video->device_list_lock); |
1924 | |
1925 | return 0; |
1926 | |
1927 | err_stop_dev: |
1928 | acpi_video_bus_stop_devices(video); |
1929 | err_free_input: |
1930 | input_free_device(dev: input); |
1931 | video->input = NULL; |
1932 | out: |
1933 | return error; |
1934 | } |
1935 | |
1936 | static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev) |
1937 | { |
1938 | if (dev->flags.notify) { |
1939 | acpi_remove_notify_handler(device: dev->dev->handle, ACPI_DEVICE_NOTIFY, |
1940 | handler: acpi_video_device_notify); |
1941 | dev->flags.notify = 0; |
1942 | } |
1943 | } |
1944 | |
1945 | static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video) |
1946 | { |
1947 | struct acpi_video_device *dev; |
1948 | |
1949 | mutex_lock(&video->device_list_lock); |
1950 | list_for_each_entry(dev, &video->video_device_list, entry) |
1951 | acpi_video_dev_remove_notify_handler(dev); |
1952 | mutex_unlock(lock: &video->device_list_lock); |
1953 | |
1954 | acpi_video_bus_stop_devices(video); |
1955 | input_unregister_device(video->input); |
1956 | video->input = NULL; |
1957 | } |
1958 | |
1959 | static int acpi_video_bus_put_devices(struct acpi_video_bus *video) |
1960 | { |
1961 | struct acpi_video_device *dev, *next; |
1962 | |
1963 | mutex_lock(&video->device_list_lock); |
1964 | list_for_each_entry_safe(dev, next, &video->video_device_list, entry) { |
1965 | list_del(entry: &dev->entry); |
1966 | kfree(objp: dev); |
1967 | } |
1968 | mutex_unlock(lock: &video->device_list_lock); |
1969 | |
1970 | return 0; |
1971 | } |
1972 | |
1973 | static int instance; |
1974 | |
1975 | static int acpi_video_bus_add(struct acpi_device *device) |
1976 | { |
1977 | struct acpi_video_bus *video; |
1978 | bool auto_detect; |
1979 | int error; |
1980 | acpi_status status; |
1981 | |
1982 | status = acpi_walk_namespace(ACPI_TYPE_DEVICE, |
1983 | start_object: acpi_dev_parent(adev: device)->handle, max_depth: 1, |
1984 | descending_callback: acpi_video_bus_match, NULL, |
1985 | context: device, NULL); |
1986 | if (status == AE_ALREADY_EXISTS) { |
1987 | pr_info(FW_BUG |
1988 | "Duplicate ACPI video bus devices for the" |
1989 | " same VGA controller, please try module " |
1990 | "parameter \"video.allow_duplicates=1\"" |
1991 | "if the current driver doesn't work.\n" ); |
1992 | if (!allow_duplicates) |
1993 | return -ENODEV; |
1994 | } |
1995 | |
1996 | video = kzalloc(size: sizeof(struct acpi_video_bus), GFP_KERNEL); |
1997 | if (!video) |
1998 | return -ENOMEM; |
1999 | |
2000 | /* a hack to fix the duplicate name "VID" problem on T61 */ |
2001 | if (!strcmp(device->pnp.bus_id, "VID" )) { |
2002 | if (instance) |
2003 | device->pnp.bus_id[3] = '0' + instance; |
2004 | instance++; |
2005 | } |
2006 | /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */ |
2007 | if (!strcmp(device->pnp.bus_id, "VGA" )) { |
2008 | if (instance) |
2009 | device->pnp.bus_id[3] = '0' + instance; |
2010 | instance++; |
2011 | } |
2012 | |
2013 | video->device = device; |
2014 | strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME); |
2015 | strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); |
2016 | device->driver_data = video; |
2017 | |
2018 | acpi_video_bus_find_cap(video); |
2019 | error = acpi_video_bus_check(video); |
2020 | if (error) |
2021 | goto err_free_video; |
2022 | |
2023 | mutex_init(&video->device_list_lock); |
2024 | INIT_LIST_HEAD(list: &video->video_device_list); |
2025 | |
2026 | error = acpi_video_bus_get_devices(video, device); |
2027 | if (error) |
2028 | goto err_put_video; |
2029 | |
2030 | /* |
2031 | * HP ZBook Fury 16 G10 requires ACPI video's child devices have _PS0 |
2032 | * evaluated to have functional panel brightness control. |
2033 | */ |
2034 | acpi_device_fix_up_power_extended(adev: device); |
2035 | |
2036 | pr_info("%s [%s] (multi-head: %s rom: %s post: %s)\n" , |
2037 | ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device), |
2038 | video->flags.multihead ? "yes" : "no" , |
2039 | video->flags.rom ? "yes" : "no" , |
2040 | video->flags.post ? "yes" : "no" ); |
2041 | mutex_lock(&video_list_lock); |
2042 | list_add_tail(new: &video->entry, head: &video_bus_head); |
2043 | mutex_unlock(lock: &video_list_lock); |
2044 | |
2045 | /* |
2046 | * If backlight-type auto-detection is used then a native backlight may |
2047 | * show up later and this may change the result from video to native. |
2048 | * Therefor normally the userspace visible /sys/class/backlight device |
2049 | * gets registered separately by the GPU driver calling |
2050 | * acpi_video_register_backlight() when an internal panel is detected. |
2051 | * Register the backlight now when not using auto-detection, so that |
2052 | * when the kernel cmdline or DMI-quirks are used the backlight will |
2053 | * get registered even if acpi_video_register_backlight() is not called. |
2054 | */ |
2055 | acpi_video_run_bcl_for_osi(video); |
2056 | if (__acpi_video_get_backlight_type(native: false, auto_detect: &auto_detect) == acpi_backlight_video && |
2057 | !auto_detect) |
2058 | acpi_video_bus_register_backlight(video); |
2059 | |
2060 | error = acpi_video_bus_add_notify_handler(video); |
2061 | if (error) |
2062 | goto err_del; |
2063 | |
2064 | error = acpi_dev_install_notify_handler(adev: device, ACPI_DEVICE_NOTIFY, |
2065 | handler: acpi_video_bus_notify, context: device); |
2066 | if (error) |
2067 | goto err_remove; |
2068 | |
2069 | return 0; |
2070 | |
2071 | err_remove: |
2072 | acpi_video_bus_remove_notify_handler(video); |
2073 | err_del: |
2074 | mutex_lock(&video_list_lock); |
2075 | list_del(entry: &video->entry); |
2076 | mutex_unlock(lock: &video_list_lock); |
2077 | acpi_video_bus_unregister_backlight(video); |
2078 | err_put_video: |
2079 | acpi_video_bus_put_devices(video); |
2080 | kfree(objp: video->attached_array); |
2081 | err_free_video: |
2082 | kfree(objp: video); |
2083 | device->driver_data = NULL; |
2084 | |
2085 | return error; |
2086 | } |
2087 | |
2088 | static void acpi_video_bus_remove(struct acpi_device *device) |
2089 | { |
2090 | struct acpi_video_bus *video = NULL; |
2091 | |
2092 | |
2093 | if (!device || !acpi_driver_data(d: device)) |
2094 | return; |
2095 | |
2096 | video = acpi_driver_data(d: device); |
2097 | |
2098 | acpi_dev_remove_notify_handler(adev: device, ACPI_DEVICE_NOTIFY, |
2099 | handler: acpi_video_bus_notify); |
2100 | |
2101 | mutex_lock(&video_list_lock); |
2102 | list_del(entry: &video->entry); |
2103 | mutex_unlock(lock: &video_list_lock); |
2104 | |
2105 | acpi_video_bus_remove_notify_handler(video); |
2106 | acpi_video_bus_unregister_backlight(video); |
2107 | acpi_video_bus_put_devices(video); |
2108 | |
2109 | kfree(objp: video->attached_array); |
2110 | kfree(objp: video); |
2111 | } |
2112 | |
2113 | static int __init is_i740(struct pci_dev *dev) |
2114 | { |
2115 | if (dev->device == 0x00D1) |
2116 | return 1; |
2117 | if (dev->device == 0x7000) |
2118 | return 1; |
2119 | return 0; |
2120 | } |
2121 | |
2122 | static int __init intel_opregion_present(void) |
2123 | { |
2124 | int opregion = 0; |
2125 | struct pci_dev *dev = NULL; |
2126 | u32 address; |
2127 | |
2128 | for_each_pci_dev(dev) { |
2129 | if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) |
2130 | continue; |
2131 | if (dev->vendor != PCI_VENDOR_ID_INTEL) |
2132 | continue; |
2133 | /* We don't want to poke around undefined i740 registers */ |
2134 | if (is_i740(dev)) |
2135 | continue; |
2136 | pci_read_config_dword(dev, where: 0xfc, val: &address); |
2137 | if (!address) |
2138 | continue; |
2139 | opregion = 1; |
2140 | } |
2141 | return opregion; |
2142 | } |
2143 | |
2144 | /* Check if the chassis-type indicates there is no builtin LCD panel */ |
2145 | static bool dmi_is_desktop(void) |
2146 | { |
2147 | const char *chassis_type; |
2148 | unsigned long type; |
2149 | |
2150 | chassis_type = dmi_get_system_info(field: DMI_CHASSIS_TYPE); |
2151 | if (!chassis_type) |
2152 | return false; |
2153 | |
2154 | if (kstrtoul(s: chassis_type, base: 10, res: &type) != 0) |
2155 | return false; |
2156 | |
2157 | switch (type) { |
2158 | case 0x03: /* Desktop */ |
2159 | case 0x04: /* Low Profile Desktop */ |
2160 | case 0x05: /* Pizza Box */ |
2161 | case 0x06: /* Mini Tower */ |
2162 | case 0x07: /* Tower */ |
2163 | case 0x10: /* Lunch Box */ |
2164 | case 0x11: /* Main Server Chassis */ |
2165 | return true; |
2166 | } |
2167 | |
2168 | return false; |
2169 | } |
2170 | |
2171 | /* |
2172 | * We're seeing a lot of bogus backlight interfaces on newer machines |
2173 | * without a LCD such as desktops, servers and HDMI sticks. Checking the |
2174 | * lcd flag fixes this, enable this by default on any machines which are: |
2175 | * 1. Win8 ready (where we also prefer the native backlight driver, so |
2176 | * normally the acpi_video code should not register there anyways); *and* |
2177 | * 2.1 Report a desktop/server DMI chassis-type, or |
2178 | * 2.2 Are an ACPI-reduced-hardware platform (and thus won't use the EC for |
2179 | backlight control) |
2180 | */ |
2181 | static bool should_check_lcd_flag(void) |
2182 | { |
2183 | if (!acpi_osi_is_win8()) |
2184 | return false; |
2185 | |
2186 | if (dmi_is_desktop()) |
2187 | return true; |
2188 | |
2189 | if (acpi_reduced_hardware()) |
2190 | return true; |
2191 | |
2192 | return false; |
2193 | } |
2194 | |
2195 | int acpi_video_register(void) |
2196 | { |
2197 | int ret = 0; |
2198 | |
2199 | mutex_lock(®ister_count_mutex); |
2200 | if (register_count) { |
2201 | /* |
2202 | * if the function of acpi_video_register is already called, |
2203 | * don't register the acpi_video_bus again and return no error. |
2204 | */ |
2205 | goto leave; |
2206 | } |
2207 | |
2208 | if (only_lcd == -1) |
2209 | only_lcd = should_check_lcd_flag(); |
2210 | |
2211 | dmi_check_system(list: video_dmi_table); |
2212 | |
2213 | ret = acpi_bus_register_driver(driver: &acpi_video_bus); |
2214 | if (ret) |
2215 | goto leave; |
2216 | |
2217 | /* |
2218 | * When the acpi_video_bus is loaded successfully, increase |
2219 | * the counter reference. |
2220 | */ |
2221 | register_count = 1; |
2222 | |
2223 | leave: |
2224 | mutex_unlock(lock: ®ister_count_mutex); |
2225 | return ret; |
2226 | } |
2227 | EXPORT_SYMBOL(acpi_video_register); |
2228 | |
2229 | void acpi_video_unregister(void) |
2230 | { |
2231 | mutex_lock(®ister_count_mutex); |
2232 | if (register_count) { |
2233 | acpi_bus_unregister_driver(driver: &acpi_video_bus); |
2234 | register_count = 0; |
2235 | may_report_brightness_keys = false; |
2236 | } |
2237 | mutex_unlock(lock: ®ister_count_mutex); |
2238 | } |
2239 | EXPORT_SYMBOL(acpi_video_unregister); |
2240 | |
2241 | void acpi_video_register_backlight(void) |
2242 | { |
2243 | struct acpi_video_bus *video; |
2244 | |
2245 | mutex_lock(&video_list_lock); |
2246 | list_for_each_entry(video, &video_bus_head, entry) |
2247 | acpi_video_bus_register_backlight(video); |
2248 | mutex_unlock(lock: &video_list_lock); |
2249 | } |
2250 | EXPORT_SYMBOL(acpi_video_register_backlight); |
2251 | |
2252 | bool acpi_video_handles_brightness_key_presses(void) |
2253 | { |
2254 | return may_report_brightness_keys && |
2255 | (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS); |
2256 | } |
2257 | EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses); |
2258 | |
2259 | /* |
2260 | * This is kind of nasty. Hardware using Intel chipsets may require |
2261 | * the video opregion code to be run first in order to initialise |
2262 | * state before any ACPI video calls are made. To handle this we defer |
2263 | * registration of the video class until the opregion code has run. |
2264 | */ |
2265 | |
2266 | static int __init acpi_video_init(void) |
2267 | { |
2268 | /* |
2269 | * Let the module load even if ACPI is disabled (e.g. due to |
2270 | * a broken BIOS) so that i915.ko can still be loaded on such |
2271 | * old systems without an AcpiOpRegion. |
2272 | * |
2273 | * acpi_video_register() will report -ENODEV later as well due |
2274 | * to acpi_disabled when i915.ko tries to register itself afterwards. |
2275 | */ |
2276 | if (acpi_disabled) |
2277 | return 0; |
2278 | |
2279 | if (intel_opregion_present()) |
2280 | return 0; |
2281 | |
2282 | return acpi_video_register(); |
2283 | } |
2284 | |
2285 | static void __exit acpi_video_exit(void) |
2286 | { |
2287 | acpi_video_unregister(); |
2288 | } |
2289 | |
2290 | module_init(acpi_video_init); |
2291 | module_exit(acpi_video_exit); |
2292 | |